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CVE-2022-26943— Weak PRNG entropy source used for authentication challenge generation in Motorola MTM5000

Quick assessment

Affected
Motorola Mobile Radio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Motorola MTM5000是美国摩托罗拉（Motorola）公司的一种移动收音机。 Motorola MTM5000 存在安全漏洞，该漏洞源于使用 PRNG 生成 TETRA 身份验证质询，并使用滴答计数寄存器作为其唯一的熵源，攻击者利用该漏洞可以根据观察到的身份验证质询，通过对可能值的详尽搜索来推导出熵池的内容。

CVSS 8.8 · High EPSS 0.35% · P29
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I. Basic Information for CVE-2022-26943

Vulnerability Information
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Vulnerability Title
Weak PRNG entropy source used for authentication challenge generation in Motorola MTM5000
Source: CVE Program / CVE List V5
Vulnerability Description
The Motorola MTM5000 series firmwares generate TETRA authentication challenges using a PRNG using a tick count register as its sole entropy source. Low boottime entropy and limited re-seeding of the pool renders the authentication challenge vulnerable to two attacks. First, due to the limited boottime pool entropy, an adversary can derive the contents of the entropy pool by an exhaustive search of possible values, based on an observed authentication challenge. Second, an adversary can use knowledge of the entropy pool to predict authentication challenges. As such, the unit is vulnerable to CVE-2022-24400.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用具有密码学弱点缺陷的PRNG
Source: CVE Program / CVE List V5
Vulnerability Title
Motorola MTM5000 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Motorola MTM5000是美国摩托罗拉（Motorola）公司的一种移动收音机。 Motorola MTM5000 存在安全漏洞，该漏洞源于使用 PRNG 生成 TETRA 身份验证质询，并使用滴答计数寄存器作为其唯一的熵源，攻击者利用该漏洞可以根据观察到的身份验证质询，通过对可能值的详尽搜索来推导出熵池的内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Motorola Mobile Radio MTM5000 -

II. Public POCs for CVE-2022-26943

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III. Intelligence Information for CVE-2022-26943

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Other References for CVE-2022-26943 (1)

Same Patch Batch · Motorola · 2023-10-19 · 4 CVEs total

CVE-2022-26941 9.6 CRITICAL Format string vulnerability in AT+CTGL command in Motorola MTM5000
CVE-2022-26942 8.2 HIGH Multiple missing pointer validation checks in trusted execution module in Motorola MTM5000
CVE-2022-27813 8.1 HIGH Unconfigured memory protection modules in Motorola MTM5000

IV. Related Vulnerabilities

Same product: Mobile Radio
Same vendor: Motorola
Same weakness: CWE-338

V. Comments for CVE-2022-26943

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